ICHNEUMON-FLIES OF AMERICA! 1. METOPIINAE 



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upper part of prepectus, and often tinges or definite marks on side and 

 apex of scutellum and on postscutellum, pale yellow; flagellum dark 

 brown beneath; sometimes lower part of propleurum and some or 

 most of mesopleurum and metapleurum fulvoferruginous; front and 

 middle legs pale yellow, their coxae basally, femora except apically, 

 and apical 0.5 ± of tibiae fulvous; hind coxa, trochanters, and femur 

 fulvous, the coxa apically and the femur at apex above, pale yellowish; 

 hind tibia whitish, its apical 0.3 ± fuscous; hind tarsus white, the 

 apical half of its fifth segment brownish. 



Figures 156, 157. — Localities: 156 (left), Exochus mesodon; 157 (right), E. megadon. 



Type: 9, Poughkeepsie, N. Y., Aug. 2, 1936, H. Townes (Wash- 

 ington, USNM 63677). 



Paratypes: 9, Voluntown, Conn., Aug. 29, 1951, H. and M. Townes 

 (Townes). 9, Shokan, N. Y., July 11, 1936, H. Townes (Townes). 

 9, Westerly, R. I., July 8, 1936, M. Chapman (Townes). 



51. Exochus megadon, new species 



Figures 190,q; 196,e 



Male: Unknown. 



Female: Front wing 5.3 to 5.8 mm. long; combined face and clypeus 

 about 0.77 as high as wide, their convexity weak in horizontal plane, 

 moderately convex in vertical plane but somewhat flattened below; 

 apical angle of interantennal process about 70 degrees; median area 

 of frons rather strongly raised and differentiated; apical margin of 

 clypeus broadly concave; mandible exceptionally large and long, 

 twisted, its apical third rotated about 60 degrees from plane of its 

 condyles (thus placing lower tooth nearer mouth), its shape apparently 

 very narrow from facial view (due to twisting) but actually quite 

 wide, its outer face with rather coarse punctures basally, its lower 

 tooth short, its upper tooth very large; second lateral area of propo- 



